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Question Number 8528 by suci last updated on 14/Oct/16

A(2,b) translation T_1 = (((−3)),((   b)) )  followed by translation T_2 = ((a),(4) )  A′=(b−1,a−3)  determine the value of a+b=...?

$${A}\left(\mathrm{2},{b}\right)\:{translation}\:{T}_{\mathrm{1}} =\begin{pmatrix}{−\mathrm{3}}\\{\:\:\:{b}}\end{pmatrix} \\ $$$${followed}\:{by}\:{translation}\:{T}_{\mathrm{2}} =\begin{pmatrix}{{a}}\\{\mathrm{4}}\end{pmatrix} \\ $$$${A}'=\left({b}−\mathrm{1},{a}−\mathrm{3}\right) \\ $$$${determine}\:{the}\:{value}\:{of}\:{a}+{b}=...? \\ $$

Answered by sandy_suhendra last updated on 14/Oct/16

2−3+a=b−1 ⇒ a−b=0 .... (1)  b+b+4=a−3 ⇒ a−2b=7 ....(2)  (1)−(2)⇒b=−7 and a=−7  so   a+b=−7−7=−14

$$\mathrm{2}−\mathrm{3}+\mathrm{a}=\mathrm{b}−\mathrm{1}\:\Rightarrow\:\mathrm{a}−\mathrm{b}=\mathrm{0}\:....\:\left(\mathrm{1}\right) \\ $$$$\mathrm{b}+\mathrm{b}+\mathrm{4}=\mathrm{a}−\mathrm{3}\:\Rightarrow\:\mathrm{a}−\mathrm{2b}=\mathrm{7}\:....\left(\mathrm{2}\right) \\ $$$$\left(\mathrm{1}\right)−\left(\mathrm{2}\right)\Rightarrow\mathrm{b}=−\mathrm{7}\:\mathrm{and}\:\mathrm{a}=−\mathrm{7} \\ $$$$\mathrm{so}\:\:\:\mathrm{a}+\mathrm{b}=−\mathrm{7}−\mathrm{7}=−\mathrm{14} \\ $$

Answered by 666225 last updated on 15/Oct/16

answer    −3+a=2≡a=5..(A)  sub.  −3+a=b−1..(A′)  −3+5=b−1≡b=3  b+4=b≡2b=4≡b=2..(A)  sub.  b+4=a−3..(A′)  2+4=a−3≡a=7  ⇒a+b=(5+7)+(3+2)=17

$$\boldsymbol{{answer}} \\ $$$$ \\ $$$$−\mathrm{3}+{a}=\mathrm{2}\equiv{a}=\mathrm{5}..\left({A}\right) \\ $$$$\boldsymbol{{sub}}. \\ $$$$−\mathrm{3}+{a}={b}−\mathrm{1}..\left({A}'\right) \\ $$$$−\mathrm{3}+\mathrm{5}={b}−\mathrm{1}\equiv{b}=\mathrm{3} \\ $$$${b}+\mathrm{4}={b}\equiv\mathrm{2}{b}=\mathrm{4}\equiv{b}=\mathrm{2}..\left({A}\right) \\ $$$$\boldsymbol{{sub}}. \\ $$$${b}+\mathrm{4}={a}−\mathrm{3}..\left({A}'\right) \\ $$$$\mathrm{2}+\mathrm{4}={a}−\mathrm{3}\equiv{a}=\mathrm{7} \\ $$$$\Rightarrow{a}+{b}=\left(\mathrm{5}+\mathrm{7}\right)+\left(\mathrm{3}+\mathrm{2}\right)=\mathrm{17} \\ $$

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